Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

Objetive. To identify the presence of Rickettsia ricketsiiand R. felis and estimate the frequency of infection in ticks infesting cattle on the coast of Chiapas state. Materials and methods. Two samplings were carried, in October 2021 and in March 2022, which included the extraction of ticks from cattle belonging to five municipalities. Diagnosis of Rickettsia ricketsii and R. felis in ticks was performed by amplification of citrate synthase gene of Rickettsia genus, fragment sequencing and sequence comparison with global databases and we calculated the minimum infection rate (MIR). Results. Rhipicephalus microplus was infected with R. felis; Amblyomma cajennense, and Rhipicephalus sanguineus were positive for Rickettsia ricketsii and the highest minimum infection rate was 72.7 per 1 000 ticks Conclusion. This is the first study in Mexico that reports Rickettsia rickettsii and R. felis infection in ticks collected from cattle in the coast of Chiapas State, which indicates a public health risk to be considered in health programs.

Objective. To estimate prostate cancer (PC) survival in Mexico and explore survival disparities according to the marginalization level of residence place. Materials and methods. A nationwide administrative claims database (4 110 men) whose PC treatment was financed by Seguro Popular between 2012-2016, was cross-linked to the National Mortality Registry up to December 2019. Patients were classified according to their oncological risk at diagnosis and the marginalization level of the residence municipality. Cox proportional hazards regression was used to estimate multivariable survival functions. Results. Five-years PC survival (69%; 95%CI: 68,71%) ranged from 72% to 54% at very low and very high marginalization, respectively (p for trend<0.001). The lowest PC survival was observed in men with high-risk PC (47%; 95%CI: 33,66%) residents in very high marginalization municipalities. Conclusions. Overall, PC survival was lower than that reported in other Latin American countries. The distribution of oncologic risk and survival differences across marginalization levels suggests limited early detection and cancer health disparities.

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Objective. To estimate the prevalence and identify the determinants of human papillomavirus (HPV) infection in young women (18-25 years). Materials and methods. We analyzed data from 5 871 sexually active women who underwent an interview and cervical swab collection for HPV screening and cytology during the enrollment visit of the HPV16/18 Vaccination Trial in Costa Rica. We calculated the total prevalence for any type of HPV, and oncogenic, nononcogenic and specific types, with 95% confidence intervals (95%CI). We used stepwise multiple logistic regression to identify determinants associated with infection. Results. The total prevalence of HPV was 50.0% (95%CI 48.8,51.3) and the prevalence by oncogenic types was 33.8% (95%CI 32.6,35.0). HPV-16 was the most prevalent type (8.3%, 95%CI 7.6,9.0). Determinants associated with a high risk of prevalent oncogenic HPV infection were: not being married/commonlaw marriage, >1 sexual partner, concomitant Chlamydia trachomatis infection, and among those with only one sexual partner in their lifetime, a partner with history of multiple sexual partners. Conclusion. The association of oncogenic HPV infections with the sexual behavior of women is confirmed and the behavior of the sexual partner is highlighted.

Objective. To estimate vaccine uptake and assess sociodemographic conditions associated with vaccination barriers and refusal and to explore the effect of a monetary incentive to overcome them. Materials and methods. We used data from adults from the 2021 National Continuous Health and Nutrition Survey conducted during August-October 2021. We evaluated if an hypothetical monetary incentive between 50-650 MXN (~2.5-31 USD) would overcome barriers or refusal. Results. 73.9% were vaccinated with at least one dose, 7.5% refused, 4.8% reported barriers and 13.8% were ineligible at the time of the survey. Refusal and barriers were more frequent in men, older age, lower education and socioeconomic status, unemployed and informal workers. In people with barriers and refusal, the hypothetical incentive increased the acceptance in 57.6% (95%CI 50.7,64.4%) and 17.4% (95%CI 13.2,21.7%) in people with barriers and refusal, respectively. Conclusion. Understanding the reasons for barriers and refusal is crucial for future Covid-19 vaccination campaigns or epidemics. A monetary incentive might increase vaccination uptake, although, cost-effectiveness analyses are needed.

Objective. To compare the prevalence of anemia and iron deficiency, at state level in non-pregnant women between 20 and 49 years of age from the Encuesta Nacional de Salud y Nutrición (Ensanut, in Spanish) 2006, 2012 and 2018-19. Materials and methods. The Ensanut 2006, 2012 and 2018-19 have a probabilistic design. Hb in capillary blood was measured by HemoCue Hb201 and ferritin by venous sample. Anemia was diagnosed with Hb<120g/L and iron deficiency with Ferritin<15ng/mL. Results. At the national level, anemia increased 6.1 (p<0.05) percentage points (pp) from 2006 to 2018-19. Baja California Norte, Campeche, Colima, Chiapas, Quintana Roo, Sinaloa and Sonora, went from low prevalence (5 to 19.9%) to moderate (20 to 39.9%); in Yucatán and Tamaulipas it went from low to severe (>40). In Guanajuato, State of Mexico and Querétaro it was reduced from 2006 to 2018-19 (p<0.05). Conclusions. Anemia continues to be a public health problem that requires actions at the state level, considering level of wellbeing index, food programs and affiliation to medical Services insurance.